Zero-setting mechanism



Sept. 22, 1936. KQTTMANN 2,054,905

I ZERO-SETTING MECHANISM Filed Sept. 8,1931 9 Sheets-Sheet l Ami/we Sept. 22,1936. KQTTMANN V 2,054,905

ZERO-SETTING MECHANISM Filed Sept. 8, 1931 9' smug-sheet 2 5 Afro/way Sept. 22, 1936. A. KGTTMANN 2,054,905

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Sept. 22, 1936. KQTTMANN 2,054,905

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Affor-rrey Patented Sept. 22, 1936 PATENT OFFICE 2,054,905 ZERO-SETTING MECHANISM August Kottmann, Sommerda, Gefinany, assignor to Rheinische Metallwaarenund Maschinenfabrik Sommerda Aktiengesellschaft,

Som-

merda, Germany, a corporation of Germany Application September 8, 1931, Serial No. 561,807 In Germany September 16, 1930 2 Claims. (01. 23573) The invention relates to improvements concerning particularly calculating machines having automatic multiplying devices in accordance with the United States Patent No. 1,973,437, wherein both factors of the multiplication problem are first preset into the same settable elements and thereupon are selectively transferred by a transfer gearing controlled by two selectors, either to the multiplicand setting elements or to the multiplier setting elements.

The invention consists in that, by means of one of the selectors of the transfer gearing, the zerosetting device for the register mechanisms of the calculating machine is simultaneously set into operation.

Thus upon the transfer of one of the factors of the multiplication problem, the zero-setting device is simultaneously set into operation, arid thereby an inadvertent omission of the zero-setting of the register mechanisms is prevented and erroneous results due thereto are avoided.

It has already been proposed to cause the zero-setting device of the registering mechanisms to be actuated, by means of the motor key. The device in accordance with the invention has the advantage over this known arrangement that it is applicable also to such calculating machines wherein the main drive of the calculating machine is caused to become engaged byv the transfer gearing by a preparing action by one of the selectors, wherein therefore no special motor switch key is present, but wherein the connecting into service of the main drive means is done by one of the two selectors.

An exemplary embodiment of the invention is disclosed in the accompanying drawings, wherein:

Fig. 1 is a side elevation of the setting element carriage with the setting elements, partly in section,

Fig. 2 is a top view showing the setting element carriage and the keyboard,

Fig. 3 is a plan view of the operating means for the rack bars which transfer the numeral values,

Fig. 4 is a plan view of a calculating machine with the drive and control elements exposed to view,

Fig. 5 is a partly sectional side elevation of the calculating machine,

Fig. 6 is a sectional detail elevation of the zero-' setting device of the setting element carriage,

Fig. 7 is an elevation of a switching device for moving the setting element carriage,

Fig. 8 is a partly sectional elevation of the the setting pins l clutch device between the rack bars and the setting discs of the stepped wheels,

Fig. 9 is a partly sectional elevation of the selecting key w ch causes the engaging of the clutching elements'of the register drive means, 5

Fig. 10 is a partly sectional elevation of the selecting key which causes the engaging of the clutching elements of multiplying mechanism,

Fig. 11 is an elevation'of a latching and unlatching drive for both selecting keys, 10 Fig. 12 is a top view of a part of the calculating machine embodying the device of the invention,

Fig. 13 is a detail showing the clearing arrangement in the position it assumes during the clearing operation, 15

Fig. 13a is a side view of a detail of Fig. 13,

Fig. 14 is a side elevation of the device, partly broken away, and

Fig 14a is a partial side view of a number of details of Fig. 14,

Fig. 15 is a side elevation of a number wheel,

Fig. 16 is a side view showing an angle member and the gears supported thereby,

Fig. 17 is a detail side elevation of the drive device for the moving of the register mechanism, 25

Fig. 18 is a rear elevation of the drive means illustrated in Fig. 1 I

Fig. 19 is a detail elevation of the moving device for the register operating gearing of the calculating machine,

Fig. 20 is a detail elevation of the drive means for moving the register mechanism,

Fig. 21 is an elevation of a locking pawl for the rack bar of the register mechanism moving means,

Fig. 22 is a detail view, partly in central longitudinal section, showing the differential mechamsm,

Figs. 22;: and 22b are sectional views of a number of details of Fig. 22, 40

Fig. 23 is aside view of further details associated with the setting discs.

Fig. 24 is an end view partly in section of the setting discs and associated parts, and

Fig. 25 is an end view of Fig. 23. 45

The setting rods I are set by the keys 2 whose key levers move the intermediate levers I which by means of their hammer-like heads 40 force out of their position of rest and which rotate about the shaft 3.

If one of these intermediate levers 4 is lifted by means of the keys 2, then the short arm 4b thereof will press against the bail 6, likewise moving about the shaft 3. The said bail 6, by means of its angle shaped end 1 and the pawl 9 engaged 6| thereby and which is oscillatable about the screw 8, will turn the angle bail ll (Fig. '1). This in turn actuates the anchors H which engage in the rack bar M (Fig. 2) and thus causes-the setting element carriage l3, driven by a spring l3a, to move into the next decimal position.

Corresponding to the number ofrows of setting pins, there are rack bars 28 (Figs. 3, supported above the setting element carriage l3, which have downwardly extending portions 281: which abut against a slide element 21. The slide element 21 is set into horizontal reciprocating pendulous movement by the motor l5, supported behind the calculating machine, through the-gearing Ni, drive element l1, clutch pawl l8, clutch disc l9, shaft 29, bevel gears 2| and 22, gear wheels 23 and 24, crank disc 25, and connecting rod 26.

In the position of rest of the drive shaft 28 the slide element 21 in Fig. 5 lies at the extreme right and moves to the left only upon the first half revolution of the crank disc 25, to return into the initial position upon the second half revolution.

The rack bars 28 are drawn to the left by the springs 29 and are thereby in position to follow the movements of the slide elements 21, in case they are not secured in the initial position by the latch 30 provided for each rack bar.

The latches 30 are disengagedby a projection |3b (Figs. 2 and 5) on the setting pin carriage l3, in the forward shifting of the latter, in such way that always only those rack bars under which rows of setting rods or pins lie can follow the slide element 21, Figs. 5 and 6. When the carriage I3 shifts laterally, only those latches 38 which lie above it will be actuated thereby.

If any setting pin in the setting element carriage I3 is struck by means of the keyboard 2, the

same will project into the field of movement of the how these gear wheels 3| rack bar 28 lying above the same. If the slide element 21 is now set into motion by means of the crank disc 25 and connecting rod 26, the rack bar 28 will follow the same until it abuts with its end 28b against the setting pin l, whereby the magnitude of movement of the rack bar 28 constitutes a measure for the numerical value at that time corresponding to the setting pin Over each of the rack bars 28 which provide for transferring the values preset in the setting pins selectively either into the calculating drive wheels 6| or into the multiplying mechanism 9|, 93, etc., there are two gear wheels 3| and 32, (Fig. 5), of which one set is in engagement with the setting discs 6| of the stepped wheels (register drive gears) and'the others with the elements 9| of the multiplying mechanism which are to be set, and

whereof as selected the one set or the other may be brought into engagement with the rack bars 28 upon the return of the slide element 21 and the latter, so that upon the return of the rack bars their movement corresponding to the preset numerical value would be transferred either to the register drive means or to the multiplying mechanism. Hereinafter it will be further explained and 32 are brought into or out of engagement with the rack bars 28.

A bar 36 (Figs. 3 and 6) is secured tothe'setting element carriage |3.and engages, by means.

of a rod 31, into the fork 38 of a shift'lever an, arranged rotatably about the shaft 39. Upon thelever 40 there is a lug 4 which, as soon as the setting element carriage |3 moves to the left during the setting operation, enters into the vicinity of the cam 35, moved by the shaft 20, through the gear wheels 33 and 34, so that the setting element carriage |3 is again pressed back into the 1 during the return of the rack bars 28,

in the direction of the arrowinitial position by this cam after completion of the digits transfer. The inclined surface 52 (Fig.

(1) provided over the setting element carriage l3 below which the setting rod carriage l3 passes on the return, provides for clearing or restoring the pins When the setting of the value in the setting pin carriage |3 has been accomplished and'the transference of the same to the register drive mechanism as a multiplicand is desired, then the Multiplicand key 43 (Figs. 4, 9 and 11) arranged in front of the machine, designated Md, should be actuated. The key 43 is pivoted about the shaft 44 and is so constructed that upon depressing it, its end 63a presses against the surface 45a of against the force of the spring 46 (Fig. 4) The slide bar 45 on the one hand carries along the bar 41, which by means of the projection 48 closes the switch 49 for supplying current to the motor l5 and bymeans of its end 5| releases, the clutch pawl l8 and thereby provides connection between the driver |1 and'the clutch disc l9 so that now the motor |5 will set the shaft 28 into rotation.

The slide bar 45 simultaneously forces the slide element 52 to the right by means of the incline 45b and thereby rocks the angle lever 53 (Fig. 8), which is pivoted in the machine frame by the pin 53a.

The fork-like end 55a of the angle lever 53 encompasses the rod 58 of the latch 51, which by a slot and pin connection 51b is shiftable on the lever 55 pivotally arranged about the point 53. The lever 55 grips between two ring formed projections 55a, 56b, of the shaft 56 which is shiftably but non-rotatably arranged in the machine frame. Hence, by rocking the lever 55 about the pin 53, the, shaft 56- is shifted for a desired distance intothe direction of its length. If by rocking the angle lever 53 the latch 51 of the lever 55 in Fig. 8 is moved downward, it

projects into the field of action of the cam 68, rotating with the shaft 59. Shaft 59 is operated by the gear wheel 24 already mentioned. If the latch 51 of lever 55 is moved downwardly by rocking angle lever 53 and the shaft 59 and thereby the cam 69 are set into rotation, then during the second half of the revolution, that is, the latch 51, the lever 55, and the shaft 56 are forced to the right by the bulge 60a, so that the gear wheels 3| (Fig. 5) freely rotatable but unshiftably set upon the shaft 56 will come into engagement with the setting discs 5| of the stepped wheels and with the rack bars 28, and thus provide a possibility of transferring from one part to the other. The numerical value preset in the setting pin carriage is therefore transferred to the register drive mechanism.

An indicating mechanism I96 (Fig. 5) in engagement with the setting discs lila permits supervision at all times of the value set in the pin wheels. The pin wheels are constructed according to the Odhner type. By the rotation of the setting discs 6|a relative to the wheels 6| Elf, the lateral projections 6|b of the radial pins Bic will in turn move out of the slot 5|d and into the slot file whereby the pins 6|c will one after another be moved outwardly. If the disc 6|a is rotated relative to the wheel 5| in such a way that five lateral projections 6|b are moved from the slot Bld into the slot Slepthen fivepins 6|c will be the slide bar 45 and shifts the same revolution, toward the end of spring H0 secures the t the key.

moved outwardly, and thereby the value 5 will be set.

The setting discs Bla are restored to their initial position by zeroizing the numeral wheels 106 (Fig. 5). The zero-setting device of the wheels I 06 may be of any suitabletype, for instance as described in German Patent No. 408,894. I

Upon an extension of shaft 20 there. is pro vided a cam disc 10'! (Figs. 3, 9, 10 and 11) with a tooth I08. The latter is so arranged that after one revolution of the shaft 20 is nearly completed it lifts the latch bail 109, which by means depressed key 43 in such depressed position, and thereby releases- At the instant that the key 43 is released, all the devices affected thereby are returned to their initial positions by means of suitably arranged springs. The shaft 28 driving the rack bars 28 therefore makes only one of which also the clutching wheels 3| providing tween the transfer rack bars 28 and the setting discs 61 of the stepped wheels are again disengaged.

If the transfer of the value preset in the setting element carriage is to take place into the multiplication mechanism 62, that is, if the value is to be used as arnultiplier, then the "Multiplier key 63 (Figs. 4, 10 and llldesignated "Mr is depressed. From this key the switch controlling the motor is closed through the connecting element 64, just as in the previously described key t3, and the clutch pawl i3 is released, that is, the drive is put in action. The member M (Fig. 4) has at its rear end a projection 64a extending to the left, which abuts against the projection 81a of the slide bar fill. Furthermore, the lever 65 is so oscillated and the slider 66 so carried along, by the key 63, that 5 and 10 show, presses the hook 61 against the shaft 69 carrying the gear wheels 32.

The hook 67 swinging motion by means of the cam disc 25 and the lever Hi, pivoted at the point 68. which is pressed against the said cam by the spring ll in such manner that during the second half of the revolution of the cam disc 25. that is, during the return of the slide element 21 and the rack bars 28, it draws the shaft 69 downwardly and brings the gear wheels 32 into mesh with the rack bars 28. Inasmuch as the gear wheels 32 onthe other hand are in engagement with the elements 9i of the multiplying mechanism which are to be set, the numerical value preset'in the setting pins is transferred into the multiplying mechanism.

The-gear wheels 32 do not come out of mesh with the gear wheels\9l inasmuch as the shaft 69 of the gear wheels 32, as well as the shaft 91a (see Fig. 5) of the gear wheels 9|, and number wheels 93 are mounted in two links 62, which in turn are swingably mounted at 62c internally on the side walls of the housing of the registering mechanism. The spacing of the shafts 69 and 9| :1 is therefore unchangeable. Both shafts are swung downwardly by the hook 67.

The hook 61 lies closely adjacent the left side wall of the machine frame in substantially the same plane as the crank disc 25, (see Fig. 4) thus rather far to the left. It projects from below into the housing 85' of the which is open .below. The number wheels 93 and the gear wheels 9| and 32 lie 'rather far to the right in the housing'of the register, as may the connection bethe slider 66, as Figs.

(Fig. 5) is set into up-and-down registering mechanism be seen from the location of the peep holes 93?) (Fig. 4). The portion of the shaft 59 which comes into engagement with the hook 61 is therefore free from gear wheels 32 and can freely slide through under the hook 61 when the register mechanisms shift.

Similarly to the key 43 provided for the multiplicand, here also the locking pawl for thekey 63 will be released after completion of the transfer, by the same device, and the elements depending also will return to their previous positions, while the supply of current to the motor is interrupted. Thus also in this transfer the shaft 20 completes only one revolution and the rack bars 28 make only a single to-and-fro motion.

After the setting of the values in the setting element carriage and their transfer into the calculating machine has been completed in the above described designated M is used, whereby, by means of the shaft 14 and the rod 75, the position of the slide it .is so changed that it releases the clutching current is supplied to the motor 15. Thus the shaft 80 is driven.

4, 20) The diiferentlal 82 (Figs. 4, 19, 22) is controlled by a locking element 86 carried in the subframe.

in engagement with the other, so that one of the two differential shafts is always free while the other is locked. Upon the locking element 88 there is provided a tooth 90,

which, upon the assumption that the corresponding member is freed for spring 86a. The yieldable connection of the slide bars 86 and 97 (through spring 86a) provides, in case any place of the multiplier is equal to Zero, so that the register mechanism moving device must be twice successively engaged, and the shaft 84 must make two successive revolutions whereby 4)' stands in the upwardly shifted position during two revolutions, that yet the slide bar'BG in Fig. 4 may transiently be shiftthat the tooth 90 can pass 4 through the notch of the slide bar 86 provided for the same. The register shifting mechanism of the calculating machine, as seen from Fig. 20, consists of a rack bar 98 secured to the register carriage 85 in the ratchet teeth of which engages a moving pawl 99' operated from the shaft 84 through the eccentric 04a so that in case the shaft 84 runs free, upon every revolution of the same the carriage will be carried on for one decimal place. -After each movement of the register mecha-' nism through one place a locking pawl I (Figs. 4, 21) falls into a second row 98a of teeth arranged laterally of the rack bar 98 from tooth to tooth and secures the carriage 85 in its position at the moment.

If the carriage moves beyond the position intended for the last place, then a cam IOI cooperating with pin. IOIlb (Fig. 21) forces the locking pawl I00 out of the ratchet teeth while simultaneously a further pawl I03 under the tension of the spring I02 falls into the notch I000. of the pawl I00 and secures it in the uninclined position, so that after completion of the calculation the carriage is automatically drawn back into the initial position by means of the spring I04 (Fig.

4) and stands ready for a further calculating operation. Upon pressing the key I3 for anew calculation operation the pawl I03 is removed from its locking position by the bar I6, so that the locking pawl I00 again falls into the ratchet teeth 9811 through the tension of spring I05.

The machine operates as follows in calculating a product:

The gear wheels 32 which are in engagement with the adjusted'elements 9i of the multiplying device come into engagement, in order, due to the shifting of the register mechanism, with a transporting pawl I40 (Figs. 18, 20) arranged unshiftably in the frame of the machine, which is made similarly to the transporting pawl 99 of the reg ister shifting mechanism device. This transporting pawl I40 is moved, by means of gear.

wheels I4I, I42, I43, shaft I44, and the eccentric disc I44a, by the drive shaft lily of the register drive mechanism 6| (Figs. 23, 24, 25") and is guided by an elongated slot on the shaft 62a.

The pawl I40 together with its drive are nonslidably mounted in the frame of the machine.

The shaft of the intermediate wheel I42 and the shaft I44 are mounted in the frame of the machine by means of holders I45, I46, and I50, whereas the shaft 62a is mounted in the intermediate walls I48 and I49 of the register housing. The shaft I44 rotates at the same speed as the shaft BIg so that upon every revolution of the shaft Blythe pawl I40 turns the wheels 32 and Ill to an extentcorresponding to the numerical value one back toward the zero position. Thus, if previously the gear wheel 9| and the number roll 93 were set to correspond to the numerical value 5, then upon the fifth rotation the number disc will pass from One to Zero and the register shifting mechanism is released. At each revolution of the register drives BI the pins 6 I 0, set in correspondence with themultiplicand, engage the intermediate wheels I221) and thereby rotate the number wheels I22 in correspondence with the multiplicand. After the multiplicand set in the register drive mechanism has been addedfive times in the result mechanism, therefore the counting mechanism carriage moves further to the extent of one place so that now the next wheel 32 comes into engagement with the transport- .ing pawl. In this position of the register mechplace together with the return of .to Zero., For those gear wheels which are set to correspond to the digit Zero, only a movement of the carriage takes place. When the ca1- culation has been carried out and the carriage has reached the end position, then as already 10 stated, the release of the latching pawl I00 takes the carriage If a Zero is contained of the multiplier which has been introduced, so that the lever 94 which corresponds to the multiplier setting member which has been set to correspond to zero in this place, is raised ab initio, then at the instant that. this said multiplier setting element which indicates a zero goes into action, the inclined part 94b, of the lever 94, enters under the horizontal arm-ofthe angle lever 95. Thereby the shifting means for the register is immediately put into engagement.

The levers 94 are bent around at the end, to form tongues or lugs 94a projecting to the left, as shown in Fig. 17. The tongues have the inclined parts 941) (Fig. 18), above mentioned, upon the left side. I

As long as the edge I000 of the pawl I00 stands below the point of the pawl I03 the slide It is I held in its position in which it closes the switch 8! to supply current to the motor I5 and releases the clutching pawl I8 so that the shaft 00 is driven. As soon as the point of the pawl I03 enters the slot I00a of the pawl I00 the slide'lt and the multiplication key return to their initial position whereby the motor and the clutch are thrown out.

By the depressing of the key lever 63 and the 40 shifting of the connecting element 64 produced thereby, a pawl I Illa in the shape of a two-armed lever, which lies with one arm in a notch of the connecting element 64 and presses with the secclnto the initial position. at any place whatever ond arm against a clutch element III, is swun to such extent about its pivotal point H2, that it releases the clutch member I I I, and the latter is brought, by the pressure of a spring H3, into engagement with a cooperating clutch element H4. Thereby transmission of motion has now become possible from the shaft 20, driven by the motor I5, to the bevel gear H5. This movement is imparted to the bevel gear H0, through bevel gear I30, shaft I3I and bevel gear I32. The shafts I3I and III and the bevel gear H9 are arranged in an angle member or bracket I20 arranged stationarily in the frame of the machine. The bevel gear H0 drives the shaft IZI of the product registering mechanism, upon which the number wheels I22 are loosely arranged. The part I2Ia of the shaft I2I projecting from the shiftable product mechanism is made squared. It can shift axially in both directions in the bevel gear H9 and can move along with the shiftable product mechanism, in which the shaft IZI is un- 5 shiftably supported, whereas the bevel gear IIS on the other hand can partake of only. the rotary movement, because it is arranged to-.- gether with gear wheel I I8 on the common, angle member I20, which is stationary in the frame of v the machine.

10 groove I 2| b, against the force of its beveled end I23a held by the tension of spring Hid in t 25 will again be located in its zero position and the 30 I26 and will spring back into its initial position,

due to the tension of spring I24, so that the pro- ;iections I 2? are removed from the region of the projections I22a.

As has already been described, the shaft 20 35 clears the zero-setting mechanism after one revparts will return to their original positions by spring action. Thereby the two armed lever or pawl I Illa and the coupling part III and also th The shaft 63, therefore ing means of the zero-setting device is therefore again disengaged after one revolution of the zerosetting shaft I2 I.

AUGUST KO MANN. 

